616d1ca5d7
Signed-off-by: David Howells <dhowells@redhat.com> Acked-by: Arnd Bergmann <arnd@arndb.de> Acked-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: Michael Kerrisk <mtk.manpages@gmail.com> Acked-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Acked-by: Dave Jones <davej@redhat.com>
122 lines
4.2 KiB
C
122 lines
4.2 KiB
C
/*
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* include/linux/nfsd/nfsfh.h
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*
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* This file describes the layout of the file handles as passed
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* over the wire.
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*
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* Earlier versions of knfsd used to sign file handles using keyed MD5
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* or SHA. I've removed this code, because it doesn't give you more
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* security than blocking external access to port 2049 on your firewall.
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*
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* Copyright (C) 1995, 1996, 1997 Olaf Kirch <okir@monad.swb.de>
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*/
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#ifndef _UAPI_LINUX_NFSD_FH_H
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#define _UAPI_LINUX_NFSD_FH_H
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#include <linux/types.h>
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#include <linux/nfs.h>
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#include <linux/nfs2.h>
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#include <linux/nfs3.h>
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#include <linux/nfs4.h>
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/*
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* This is the old "dentry style" Linux NFSv2 file handle.
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*
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* The xino and xdev fields are currently used to transport the
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* ino/dev of the exported inode.
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*/
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struct nfs_fhbase_old {
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__u32 fb_dcookie; /* dentry cookie - always 0xfeebbaca */
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__u32 fb_ino; /* our inode number */
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__u32 fb_dirino; /* dir inode number, 0 for directories */
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__u32 fb_dev; /* our device */
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__u32 fb_xdev;
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__u32 fb_xino;
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__u32 fb_generation;
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};
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/*
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* This is the new flexible, extensible style NFSv2/v3 file handle.
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* by Neil Brown <neilb@cse.unsw.edu.au> - March 2000
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*
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* The file handle starts with a sequence of four-byte words.
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* The first word contains a version number (1) and three descriptor bytes
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* that tell how the remaining 3 variable length fields should be handled.
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* These three bytes are auth_type, fsid_type and fileid_type.
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*
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* All four-byte values are in host-byte-order.
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*
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* The auth_type field specifies how the filehandle can be authenticated
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* This might allow a file to be confirmed to be in a writable part of a
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* filetree without checking the path from it up to the root.
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* Current values:
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* 0 - No authentication. fb_auth is 0 bytes long
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* Possible future values:
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* 1 - 4 bytes taken from MD5 hash of the remainer of the file handle
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* prefixed by a secret and with the important export flags.
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*
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* The fsid_type identifies how the filesystem (or export point) is
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* encoded.
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* Current values:
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* 0 - 4 byte device id (ms-2-bytes major, ls-2-bytes minor), 4byte inode number
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* NOTE: we cannot use the kdev_t device id value, because kdev_t.h
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* says we mustn't. We must break it up and reassemble.
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* 1 - 4 byte user specified identifier
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* 2 - 4 byte major, 4 byte minor, 4 byte inode number - DEPRECATED
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* 3 - 4 byte device id, encoded for user-space, 4 byte inode number
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* 4 - 4 byte inode number and 4 byte uuid
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* 5 - 8 byte uuid
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* 6 - 16 byte uuid
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* 7 - 8 byte inode number and 16 byte uuid
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*
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* The fileid_type identified how the file within the filesystem is encoded.
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* This is (will be) passed to, and set by, the underlying filesystem if it supports
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* filehandle operations. The filesystem must not use the value '0' or '0xff' and may
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* only use the values 1 and 2 as defined below:
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* Current values:
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* 0 - The root, or export point, of the filesystem. fb_fileid is 0 bytes.
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* 1 - 32bit inode number, 32 bit generation number.
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* 2 - 32bit inode number, 32 bit generation number, 32 bit parent directory inode number.
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*
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*/
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struct nfs_fhbase_new {
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__u8 fb_version; /* == 1, even => nfs_fhbase_old */
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__u8 fb_auth_type;
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__u8 fb_fsid_type;
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__u8 fb_fileid_type;
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__u32 fb_auth[1];
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/* __u32 fb_fsid[0]; floating */
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/* __u32 fb_fileid[0]; floating */
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};
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struct knfsd_fh {
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unsigned int fh_size; /* significant for NFSv3.
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* Points to the current size while building
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* a new file handle
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*/
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union {
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struct nfs_fhbase_old fh_old;
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__u32 fh_pad[NFS4_FHSIZE/4];
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struct nfs_fhbase_new fh_new;
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} fh_base;
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};
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#define ofh_dcookie fh_base.fh_old.fb_dcookie
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#define ofh_ino fh_base.fh_old.fb_ino
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#define ofh_dirino fh_base.fh_old.fb_dirino
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#define ofh_dev fh_base.fh_old.fb_dev
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#define ofh_xdev fh_base.fh_old.fb_xdev
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#define ofh_xino fh_base.fh_old.fb_xino
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#define ofh_generation fh_base.fh_old.fb_generation
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#define fh_version fh_base.fh_new.fb_version
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#define fh_fsid_type fh_base.fh_new.fb_fsid_type
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#define fh_auth_type fh_base.fh_new.fb_auth_type
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#define fh_fileid_type fh_base.fh_new.fb_fileid_type
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#define fh_auth fh_base.fh_new.fb_auth
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#define fh_fsid fh_base.fh_new.fb_auth
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#endif /* _UAPI_LINUX_NFSD_FH_H */
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